Abstract Detail



Donald J. Pinkava’s legacy – the ASU Herbarium in the Sonoran Desert

Baker, Marc A. [1].

Implications of cytogenetics in the evolution and taxonomy of Cactaceae.

Cytogenetics can provide valuable insights into evolutionary relationships, with advantages of both morphological and molecular studies, in that chromosome number, size, shape, and behavior are traits that are both visible and hereditary. Chromosome races within a species are genetically isolated from one another, which creates the potential for genetic drift. Chromosome size, shape, and behavior are often useful for differentiating taxa, especially when correlated with other forms of data. Examples of meiotic studies that have facilitated such taxonomic decisions will be presented. Meiotic behavior and subsequent pollen formation is also useful in evidencing recent hybridization. Pollen stainability, which has been shown to be much reduced in putative hybrids, is a simple and useful tool. Other aspects of polyploidy will be discussed, such as the notion that odd polyploidy, at least in triploids, may not be an evolutionary dead-end but rather a means for punctuated evolution.


1 - Arizona State University, School of Life Sciences, PO Box 874501,, Tempe, Arizona, 85287-4501, USA

Keywords:
cytogenetics
Caclaceae
evolution
taxonomy.

Presentation Type: Colloquium Presentations
Number: 0005
Abstract ID:224
Candidate for Awards:None


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